Exhibit 99.1 SIGA Reports Financial Results for Three and Twelve Months Ended December 31, 2023 • Increased Product Sales to $131 Million in 2023 • Grew Pre-tax Operating Income to$84 Million in 2023 • Declared Today a Special Cash Dividend of $0.60 per Share • Corporate Update Conference Call Today at 4:30 PM ET NEW YORK -- SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company, today reported financial results for the three and twelve months ended December 31, 2023. “In ...